Brush block



FIG. 1 is a perspective view of a brush block showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is an end elevational view, the opposite end being a mirror image thereof. 

The ornamental design for a brush block, as shown and described. 